Supernumerary Kidney (Triple Kidney) With Horseshoe Component: A Case Report.

Abstract

Supernumerary kidney is a rare congenital anomaly of the urinary system with less than 100 cases documented in literatures worldwide'>'. Very rarely documented is the fused supernumerary kidney and horseshoe component with unknown incidence, due to the rarity of this complex anomaly. We hereby present a rare case of complex renal anomalies of fused supernumerary kidneys with horseshoe component misdiagnosed as an abdominal tumour on ultrasound, incidentally discovered at Computed Tomography. Introduction Supernumerary kidneys are rare congenital anomaly of the urinary system with less than 100 cases documented in literatures worldwide - 3 . The true incidence is unknown due to the rarity of the anomaly and it is believed to be found in both sexes with equal frequency': 2. Embryologically, supernumerary kidney is believed to results from abnormal division of the 1 nephrogenic cord into two metanephric blastemas that eventually form two kidneys with partial or duplicated ureteral bud': 3- 5, this occurs during the period of urogenital system formation about the 5th to -7thweekof gestation". No racial predominance is documented in the literature. And most cases of supernumerary kidneys are discovered incidentally" Diagnosis and treatment are commonly challenging due to the rarity of this anomaly, its varied presentation and sparse documentation in literatures" 8. Though horseshoe kidneys are relatively common renal fusion anomaly with an incidence of about one in 400-800 live births". Coexisting supernumerary and horseshoe kidney are however very rarely documented..